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Statements of Consolidated Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES      
Net income $ 29,761 $ 23,336 $ 26,581
Adjustments to reconcile net income to net cash provided by operations:      
Depreciation and amortization 13,838 13,748 12,444
Provision for accounts receivable allowances 2,053 2,132 1,206
Provision for inventory reserves 2,035 1,283 2,402
Deferred income taxes (3,380) (1,274) 314
Share-based compensation expense 4,089 4,396 4,236
Loss (gain) on sale of property and equipment 1,108 10 (156)
Other - net 6 292 192
Changes in operating assets and liabilities assets:      
Accounts receivable (10,539) (9,777) (4,499)
Inventories 80 (9,455) (13,703)
Prepaid expenses (8,786) (932) (3,723)
Trade accounts payables and accrued liabilities 6,952 6,087 3,048
Income taxes, net 3,470 634 (1,896)
Contributions to company pension plan (330) 0 (5,340)
Other - net 1,285 (3,263) 1,870
NET CASH PROVIDED BY OPERATING ACTIVITIES 41,642 27,217 22,976
INVESTING ACTIVITIES      
Capital expenditures (24,569) (29,467) (9,528)
Proceeds from the sale of property and equipment 10,525 54 195
Purchase of marketable securities 0 (496) (4,690)
Proceeds from sale of marketable securities 0 2,309 2,953
Purchase of company owned life insurance policies 0 (2,309) (2,953)
Acquisition of businesses, net of cash 0 (18,894) 0
NET CASH USED IN INVESTING ACTIVITIES (14,044) (48,803) (14,023)
FINANCING ACTIVITIES      
Increase (decrease) in notes payable to banks 9,465 (355) 8,446
Proceeds from long-term debt 90,847 93,036 76,030
Payments of long-term debt (110,083) (64,124) (85,496)
Dividends paid (4,184) (4,230) (4,088)
Proceeds from issuance of common shares 252 213 222
Purchase of common shares for treasury (5,836) (2,800) (191)
Purchase of common shares for treasury from related parties (3,626) (4,026) (3,974)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES (23,165) 17,714 (9,051)
Effects of exchange rate changes on cash and cash equivalents 1,479 (775) (1,591)
Net increase (decrease) in cash, cash equivalents and restricted cash 5,912 (4,647) (1,689)
Cash, cash equivalents and restricted cash at beginning of year 39,263 43,910 45,599
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR $ 45,175 $ 39,263 $ 43,910